Low buck ET engine

[Mac]

I know you seem set on them "P" heads but that limits you in header selection. Some plain GT40's for sale on E-bay that when ported right, will flow good also and open up you selection of headers like the Tri-Y's and others. If you are going to port them "P"s, better check out the articles by Tom Moss, the expert on them. That Funnel Web intake is going to be way over kill for that motor. Likes a bigger one with a big cam and 4-8K rpm's. Quick check on Google said best to stick with a Eldebrok preformer, rpm or air gap style. That picture of the pistion at the bottom between the eyebrows looks to be stamped with .040 indicating the overbore and maybe some part numbers under those. Just another heads up.
Dave

 

[92ranger18]

I know you seem set on them "P" heads but that limits you in header selection. Some plain GT40's for sale on E-bay that when ported right, will flow good also and open up you selection of headers like the Tri-Y's and others. If you are going to port them "P"s, better check out the articles by Tom Moss, the expert on them. That Funnel Web intake is going to be way over kill for that motor. Likes a bigger one with a big cam and 4-8K rpm's. Quick check on Google said best to stick with a Eldebrok preformer, rpm or air gap style. That picture of the pistion at the bottom between the eyebrows looks to be stamped with .040 indicating the overbore and maybe some part numbers under those. Just another heads up.
Dave

Man Mac you sir have got some good eyes i did not ever know that it was bored over any. Not being sarcastic either lol. And as for header option i was gonna build a set of custon long tubes out of some spair sets i have laying around. I have got an performer rpm intake now and an edelbrock 600. Since you say i should stay with a performer intake i will. What would be a good cam to use?

 

[shane96ranger]

I know you seem set on them "P" heads but that limits you in header selection. Some plain GT40's for sale on E-bay that when ported right, will flow good also and open up you selection of headers like the Tri-Y's and others. If you are going to port them "P"s, better check out the articles by Tom Moss, the expert on them. That Funnel Web intake is going to be way over kill for that motor. Likes a bigger one with a big cam and 4-8K rpm's. Quick check on Google said best to stick with a Eldebrok preformer, rpm or air gap style. That picture of the pistion at the bottom between the eyebrows looks to be stamped with .040 indicating the overbore and maybe some part numbers under those. Just another heads up.
Dave

Good eye Dave. I didn't look that close. Carb talk is Chinese to me. I can just tell you what CFM is ideal for a 302, and that's about it LOL.

 

[92ranger18]

Good eye Dave. I didn't look that close. Carb talk is Chinese to me. I can just tell you what CFM is ideal for a 302, and that's about it LOL.

What cfm would be best for it.

 

[dangerranger83]

I read that you can't use an HO cam with gt40p heads unless you change the valve springs.

As far as cfms, 500 is a good starting point for a stock 302.

I'm running a stock 91 302 converted to HO with a simple mustang cam swap bumping it to 200hp topped with an edelbrock 289 performer dual plane and 1403 edelbrock (500 cfm) carb.

Sent from my rooted SPH-D710 using Tapatalk 2

 

[shane96ranger]

I still have the Explorer valve springs on an HO cam and 1.7 rockers. It runs fine. EDIT: I might add that the motor they came off of only had 68,000 miles on it. I'm still kicking myself for not getting the whole motor.

I am shifting at 6200rpm on this video:


For what he is planning on running, a 600cfm is prefect - at least at this elevation.

 

[92ranger18]

I still have the Explorer valve springs on an HO cam and 1.7 rockers. It runs fine. EDIT: I might add that the motor they came off of only had 68,000 miles on it. I'm still kicking myself for not getting the whole motor.

I am shifting at 6200rpm on this video:


For what he is planning on running, a 600cfm is prefect - at least at this elevation.

Man that thing sounds sweet and runs great. And Mac im not set on the "P" heads just looking for something a little better than stock while i got them off changeing a blown head gasket. When income tax season comes around next time i plan on mathching alluminum heads and cam.

 

[JoshT]

Since you are planning aftermarket heads I really suggest going with a non "P" head. The exhaust youbsetmup for them will easily work with what ever aftermarket head you end up with. The standard GT40 head might be a good choice for you, they are the 96-97 Explorer heads.

 

[dangerranger83]

Here's a link to a sight describing in the differences between P and non P heads.
http://www.fiveohinfo.com/performance/gt40-gt40p.html

It is recommend to change out the valve springs on the P heads to some aftermarket ones, which wouldn't be a bad idea anyways.

EDIT: I wonder if I can stick a set of the non P heads on my 91 (originally a non HO block) and the valves clear the pistons, I can pick them up real easily. I know the e7 heads clear the pistons.


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[92ranger18]

How about a set of clevland heads. Im told i would have to use a special head gasket but what about intake? Will i be able to use my performer intake? I can get a set of these heads for 50 bucks just need rebuilt what do you guys think

 

[shane96ranger]

How about a set of clevland heads. Im told i would have to use a special head gasket but what about intake? Will i be able to use my performer intake? I can get a set of these heads for 50 bucks just need rebuilt what do you guys think

Are they 2 barrel or 4 barrel heads. You need to google "Ford Clevor" for information on what needs to be done. I believe it involves more than a simple gasket change.

EDIT: Look at the info in here:

http://forums.corral.net/forums/5-0-5-8-engine-tech/1299695-boss-302-build-aka-clevor-how.html

Sent from my Quad Core Acer A210

 

[92ranger18]

Are they 2 barrel or 4 barrel heads. You need to google "Ford Clevor" for information on what needs to be done. I believe it involves more than a simple gasket change.

EDIT: Look at the info in here:

http://forums.corral.net/forums/5-0-5-8-engine-tech/1299695-boss-302-build-aka-clevor-how.html

They are 2 bbl heads and ive read that i can use a 289 crank and rods with the special boss pistons. But i cant find anything about using a 302 crank 289 rods with the boss pistons any idea if it would work?

 

[Mac]

Read post #11 of that link Shane posted. The original Boss motor used basically the 289 rods but with better rod bolts/design. Same rod length of 5.155 and then used the 302 crank. Way too much work with the machining and special costly parts, pistons, intake, headers. Much better off just to go with a 331/347 stroker. I did caution you of that overbore already in that block.
Dave