HP500 - what CR can it take with 088-heads?

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11-04-2018 | 09:14 PM

#11

mike tkach

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Joined: Oct 2007

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From: yorkville,il

Quote:

Originally Posted by Baja Rooster

Someone on here with twins mentioned they had two similar engines but one was a CR point higher and he couldn’t tell any difference between the two. All of the power gains are to be found in the head with compression and cam being a factor to support it, not the other way around. I’m a complete hack, but that’s my understanding of it.

if you go from 9-1 to 10-1 you could see as much as 40 hp without any other changes.that being said,one engine making an extra 40 hp might see a one mph gain in top speed.

11-04-2018 | 09:19 PM

#12

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From: On A Dirt Floor

Never understand guys that don't realize the importance of good head.

11-04-2018 | 10:48 PM

#13

Baja Rooster

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Joined: Oct 2013

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From: SF Bay Area

Quote:

Originally Posted by mike tkach

if you go from 9-1 to 10-1 you could see as much as 40 hp without any other changes.that being said,one engine making an extra 40 hp might see a one mph gain in top speed.

Would the difference be more dramatic on Dart heads than 088s?

Quote:

Originally Posted by SB

Never understand guys that don't realize the importance of good head.

Paramount!

11-04-2018 | 11:57 PM

#14

Griff

Charter Member # 55

Joined: Oct 2000

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From: Omaha/LOTO

The HP500 carb cam is not that great to start with.
You would probably gain as much or more hp by swapping to Crane 168741 cam and leaving the CR where its at.

11-05-2018 | 03:07 PM

#15

McNick

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Thanks for all the input. I live in europe and aluminium heads are like 4000 dollars so that’s out of budget. I think I’ll just stay with my flat pistons and zero deck the block to get 9:1 CR or maybe a little bit more. The ignition and everything else is HP500 original so maybe it’s better to stay there and save money for a 540 with good heads. I bought my formula 271 fastech from floria 2 years ago and shiped it over here.

11-05-2018 | 11:54 PM

#16

KeatonAZ

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Joined: Apr 2015

Posts: 75

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From: Arizona

Quote:

Originally Posted by SB

Never understand guys that don't realize the importance of good head.

Engine masters proved this several times...

https://www.dailymotion.com/video/x6bw4zt
https://www.dailymotion.com/video/x3wv3g2
https://www.dailymotion.com/video/x5s4f8w

end of the day, put the best cylinder head on that you can afford.

11-06-2018 | 06:14 PM

#17

getrdunn

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Joined: Feb 2009

Posts: 8,356

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From: NW Michigan

Quote:

Originally Posted by KeatonAZ

Depending on your goals and personal opinion I prefer to purchase a non cnc head and let your head guy work his magic and do your porting and set up your heads for your particular app. Not only can you blow away the cnc head flow numbers you can pick up and bolt on with confidence and in many cases with less runner CC's. Price might be a tad more but worthy and proven. My experience anyway.