RE: [Classic Mustang] 78 302 GHIA Which heads would work best?.... Stock engine

I’m sure this may have been addressed previously but what performance changes will you see using a set of 351M/400 2v 78.4 cc heads on a 351C in lieu of the Cleveland 2v 76.2 cc heads.  2v Cleveland heads are getting scarce & costly.

 

Minimal research has indicated that other than the cc size, the M/400 2v heads are the same as the Cleveland 2v ones.

 

Has anyone 1st hand experience on this?

 

Thanks,

 

Lee

 

 

From: classicmustang@yahoogroups.com [mailto:classicmustang@yahoogroups.com] On Behalf Of Michael D. Myjak
Sent: Thursday, April 09, 2009 3:44 PM
To: classicmustang@yahoogroups.com
Subject: Re: [Classic Mustang] 78 302 GHIA Which heads would work best?.... Stock engine

 

Mike,

You'll do better with the 351W heads. They breath much better than the
289/302 heads ever did. You'll need to do some fiddling with the head
bolt size change, but that's about it.

The Holley 650 DP will dump more gas than you can ever imagine - or use
appropriately - on the street. Get a 550 or 600 CFM Holley w/ vacuum
secondary. LIST-1850 will likely work right out of the box for you. The
Offie will work just fine.

A shot in the dark guesstimate is that you can probably expect about a
50HP bump. Add a set of headers (Tri-Y or full-tube) and you can gain
another ~20-25HP.

If you are really serious about increasing the ponies (upwards of 100+),
then while you have the heads off... drop a new cam shaft into the
block. I wouldn't recommend anything too radical - just keep the intake
and exhaust lift at or below .5" and you'll likely do fine. (Over .5"
lift and you'll need to modify the heads to add bolt-in rocker arm studs
and push-rod guide plates.)

Toss in a 351-C set of open chambered heads and matching intake and
you'll have the makings of boss mustang!

My thots -

Michael

stinkydogfilms@sbcglobal.net wrote:
> I want more power from my 78 Stock 302W with a C4 and 2.79 rear. I have a set of 68 302 4V heads and a set of 69 351W 4V heads.... probably gonna use a 4100 4V Autolite/Offenhauser 360.... Which heads would work best with only intake and carb modifications? 4100 carb or Holley 650 DP.... Anything to gain using 289 heads? Any estimates on HP increase?
>
> Thank you,
> Mike
>
>

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