302 heads on 351m?

Boggin · May 29, 2011

hey guys, im wondering if 302 heads will fit on my 351m? i am pretty sure they will, since the 351c heads fit both the 351m and 302, but most of all, if they heads do fit, will there be any advantages/disadvantages? i have a set of 302 heads that are ported and polished from an 87 5.0 HO and the heads in my 351m have never been off or polished or cleaned up and pretty much every exhaust stud is twisted off in them so they need to come off anyways. so im wondering if these 87 302 heads would work for me. thanks!

adsm08 · May 29, 2011

Well it would increase compression which would increase power. If it works.

The only problem that I can see that you are likely to encounter is head bolts. I know on the Windsor engines the 351 head bolts are bigger around than the 302 bolts. I don't know if that carries over to the M block or not, but I would guess it does. My suggestion would be to spend the $2 to get a head bolt and see if it fits through the hole in the 302 head.

Boggin · May 29, 2011

Are regular grade 8 bolts good enough for the heads or do it have to be head bolts?

shane96ranger · May 29, 2011

I've heard of Cleveland heads on a Windsor, but not the reverse. Maybe you can use this article to help you get there.

http://www.darkhorseracing.net/clevor_head_mod.htm

v-8power · May 29, 2011

You should post this question in the v8 forum. The 351M is a different monster compared to the windsor block engines.

Boggin · May 29, 2011

i know the engines are different. just wondering if it could work, and never though of posting it there at that time

stevealvey24 · May 29, 2011

Theres a couple things that are different if I'm remembering right. First you will have to drill the heads for 1/2" bolts as 302's are 7/16". Also if I remember right the intake is a different bolt pattern and I'd say theres not an intake available to fit the large width of the 351/400 block.

pjtoledo · May 30, 2011

and something about water passages at the front of the heads. welding holes on one surface and making new holes on the other surface. I'd check the compression ratio and chamber size on both heads as there may be nothing to gain.

brinker88 · May 31, 2011

If it were a windsor, yea...not really sure about the M

302 heads on 351m?

Boggin

Well-Known Member

adsm08

Senior Master Grease Monkey

Boggin

Well-Known Member

shane96ranger

Well-Known Member

v-8power

Well-Known Member

Boggin

Well-Known Member

stevealvey24

New Member

pjtoledo

Well-Known Member

brinker88

11/2013 OTOM Winner

Sponsored Ad

Sponsored Ad

Members online

Member & Vendor Upgrades

Latest posts

Truck of The Month

Recently Featured

Follow TRS On Instagram

Latest Album Photos

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store

Sponsored Ad

Sponsored Ad

Sponsored Ad

Amazon Deals