afr

[ms93gt]

Whats the difference between the 60cc and 58cc afr 165 heads.

 

[Modular2v]

correct me if im wrong but i belive the XXcc represents chamber size....with the 58cc heads you are going to see higher compression

 

[ms93gt]

So with my 306 with 10:1 compression which should I get?

 

[stang22]

There are a number of factors that determine compression. Take a look...

http://www.smokemup.com/auto_math/compression_ratio.php

Tim

 

[ms93gt]

I already know that my motor has 10:1 compression. I need to know which head to buy, the 60cc or 58cc.

 

[stang22]

Ahhh...

What CC head was you 10:1 compression calculated with. Surely that will change with the 58CC or the 60CC and vice versa. I am not sure how much it will change, but...

Tim

 

[ms93gt]

The heads that were on the motor were edlebrock performer rpms.

 

[stang22]

All of the Performer heads were 60cc, unless someone plained/shaved them.

http://www.edelbrock.com/automotive_new/mc/heads/ford_sb_performer.shtml

Tim

 

[ms93gt]

Ok well which size cc should I get? The reason I'm saying I have 10:1 comp is because I have speed pro forged pistons for 10:1. So which cc afr head would be best?

 

[stang22]

Higher compression (NA'd), more horse power. Maybe Rick or one of the veterans will chime in. I don't want to give you any bad information.

Tim

 

[Rick 91GT]

The combination of the piston, gasket thickness, deck height and chamber size determine most of the compression.

IF you had 10:1 with a 60cc head you can stay with a 60cc AFR or go to a 58cc that will bump the compression up a small amount. I can not tell you what you truly have without the above specs.

What is the PT on the piston, what size reliefs does it have, etc...

The 58cc is a better head, it has a different style chamber that is more efficent then the AFR 60cc.

I find may guys think they have a lot more compression then they truly have once you do all the math.

 

[stang22]

The combination of the piston, gasket thickness, deck height and chamber size determine most of the compression.

IF you had 10:1 with a 60cc head you can stay with a 60cc AFR or go to a 58cc that will bump the compression up a small amount. I can not tell you what you truly have without the above specs.

What is the PT on the piston, what size reliefs does it have, etc...

The 58cc is a better head, it has a different style chamber that is more efficent then the AFR 60cc.

I find may guys think they have a lot more compression then they truly have once you do all the math.

I knew you would come to the rescue!

Tim

 

[ms93gt]

Well the reason I am asking is because there is a set of 165's 60cc on ebay for $355 with 7 days left. Should I bid on them? If theres no power difference then I won't care but like I have been stating I want the most power out of the engine but I also can not pass up deals such as saving money on those afr's.

 

[Rick 91GT]

Well that is REALLY CHEAP, just be careful, check out the bidder. Buying used heads can be scary.

 

[87GT 306]

thats alot of time for an auction too. Wouldn't be suprised if they sell for around a thousand if they are in tact and nothing is wrong with them. AFR heads hold thier value. Ive watched them used on ebay for a while and just determined to buy the new stud mount 58cc set for 1299 shipped.

 

[cjman15]

That's another thing... what's the difference between stud and pedestal mount heads?

 

[Rick 91GT]

The way the rocker attaches, the stud mount are stronger.

 

[cdog301]

heads

ad performance has the afr 165 heads 61cc for 1309.00 shipped to your door why risk it with the used ones!

 

[87GT 306]

ad performance has the afr 165 heads 61cc for 1309.00 shipped to your door why risk it with the used ones!

do they have them in stock though?

 

[skip nay]

All of the Performer heads were 60cc, unless someone plained/shaved them.

http://www.edelbrock.com/automotive_new/mc/heads/ford_sb_performer.shtml

Tim

Ok then why are mine 62.4cc and the other one is 62.2cc they have been corrected though?