Are you planning on boost at some point? Nitrous? It is truthfully not that much difference in cc.
No no N20. As for boost, well I doubt it, don't think $ will ever allow.Are you planning on boost at some point? Nitrous? It is truthfully not that much difference in cc.
Eh I think I'll stick w the 61's.Play around with this compression calculator:
http://www.summitracing.com/expertadviceandnews/calcsandtools/compression-calculator
There is about a .35 difference in compression between the two, so the difference is not huge.
Pros:
-Compression is free power.
Cons:
-Boost won't be impossible, but more caution should be taken if going with the 58cc head.
-The 58cc head will make getting pump-gas-friendly compression ratios slightly more difficult, but not impossible, should you choose to stroke it in the future. This is even more exasperated if you go to a stroked Windsor.
Life choices here.
Agreed and x2!!!They say that on average a point of compression is worth about 3-4% in power. So if that rule of thumb is right, and the difference in compression ratio is only .35, that sounds like a 1% difference, or so. If I knew I was sticking to n/a or preferred nitrous in the future instead of boost, I'd go with the chambers. If I wanted to leave myself a little more flexibility, I'd go with the bigger ones.
Damn it... Still a tough choice. The smaller ones say they use 1/2" bolts. So does that mean I gotta drill and tap? 1% difference, prob noticeable huh?They say that on average a point of compression is worth about 3-4% in power. So if that rule of thumb is right, and the difference in compression ratio is only .35, that sounds like a 1% difference, or so. If I knew I was sticking to n/a or preferred nitrous in the future instead of boost, I'd go with the smaller chambers. If I wanted to leave myself a little more flexibility, I'd go with the bigger ones.
Damn it... Still a tough choice. The smaller ones say they use 1/2" bolts. So does that mean I gotta drill and tap? 1% difference, prob noticeable huh?
Ok thanks manYou are probably talking about the bolts that hold the head down to the block.
Either way you are buying a set or ARP bolts (at $150), just buy the right set.
They will probably take a 1/2 bolt stepped to 7/16 (if i remember correctly).
Yeah, you'll need to buy stepped washers for your heads if bolting them to a 302. Trick Flow sells them too. I think they're about $60?
Well, 1% of 300rwhp would be 3 rwhp. That's probably hard to consistently notice even on a dyno.Damn it... Still a tough choice. The smaller ones say they use 1/2" bolts. So does that mean I gotta drill and tap? 1% difference, prob noticeable huh?
I don't think you need the stepped washers with the stepped bolts.
http://www.summitracing.com/parts/ARP-254-3708/
Everything else being equal, a engine with a cast iron head will make more power than an engine with aluminum heads. Heat is power, and a iron head will hold more heat in the combustion process than an aluminum head will.
If you built two 10.0:1 compression engines and everything between the 2 was exactly the same, except for one had cast iron heads, and one had aluminum heads (both sets of heads flow exactly the same) the cast iron headed engine will always make more power. Period. The thing is you can never find cast iron heads that are worth a crap. And in a car the loss of 50 lbs off of the nose of the car and the better architecture/design of the aluminum head (as opposed to commercially available cast iron heads) is a better head anyway. But from an engineering point of view when looking only at HP production, the cast iron head is "better".Didn't notice those, but for the price, it would be just as const effective, or more so to buy standard bolts, with the stepped washers. Six in one, half a dozen in the other I suppose?
Not necessarily true. Heat = power for certain....but heat can also equal detonation unless you're got a high enough octane content in your fuel to keep pre-ignition at bay. If not, timing needs to be pulled and down too goes the power levels as a result. Aluminum heads are more resistant to detonation, which will allow the use of more ignition timing.
I suppose if ALL things were equal, an iron head "could" produce more power. But that would only be in the case that the aluminum heads are not being utilized to their fullest potential. Aluminum heads will handle more heat, more compression and more timing than an equal iron head and will therefore make more power.
If you built two 10.0:1 compression engines and everything between the 2 was exactly the same, except for one had cast iron heads, and one had aluminum heads (both sets of heads flow exactly the same) the cast iron headed engine will always make more power. Period.
Believe what you want dude, I have seen it happen. Many times.Negative
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