I am considering Building a new engine. I am looking for a high MPH SC combination. I was leaning towards a 632 with 12 degree heads but it was suggested to me to look at a 615 with SR20 heads. I am nor looking to save money but I don't want to waste money either. I am looking for recommendations for either combinations.

No contest, spreadport head.

Who’s building the engine?

Charlie Bellotti. He has been building my motors for as long as I have been racing.

SR-20 for sure...get in touch with Scott or KB at PAR they got a new combination with that 615...I’ve got both the extra weight you gain with a spreadport just aint worth it in my opinion and oh yeah I got both a 655 9 degree and a 632 SR20....for bracket racing SR20 for sure....

The 615 SR20 built correctly can, will, and often does run right beside the spreadport motors. The spreadport motor may make a little more power but will outweigh the SR20 motor. I prefer the lighter SR20 set up. Just preference, I own and race both set ups...one 598 SR20, and one 632 spreadport. They both have run 4.4's...Spanky just redid the 598 SR20 and picked it up 70 hp with cam and carb change. Think it may be upper 30's at the 1/8 now, but will find out in about 5 weeks at the southern big buck nats.

This thread can be an informative if derailment is avoided.

I have a JA Performance built 632 SR20, no big cam, easy on springs and repeats like a clock. Makes real good power. Charlie is good people.

The OP stated he wanted a “high mph SC combination” and I have yet to see with my own eyes an Sr20 headed 600+ bbc run as much mph as a spread portheaded 600+ bbc in similar weight dragsters competing in super comp here in division 1.

Further, as I stated in another thread, there are currently only 3 cars in the division that run better mph than my car in SC, two of them are sr20 engines and they run 1-1.5 mph faster and the other is a spread port engine that runs 2+mph faster.

Last, if I lived on Long Island, James Antoneli would be building my super comp engine.

James Antonette,,JA Race Engines

what do the cars weigh ? it seems to me the conv does not make the peak torque a spread will .

My car weighs 1975 lbs. going down the track, heavier than the 3 cars with faster mph

what does it et in 1/4

Typical ETs in July/August at Numidia is 7.31 - 7.33. Best at Numidia to date is 7.23

My 9 degree might be 2 mph better...still not worth the trade off...and that’s with the older cam in my Sr20...I’m telling you they got these Sr20 figured out....

And I’m telling you if you want the fastest mph in super comp, your best shot at owning it is a spread port engine built by the right guy.

I have owned two 632 SR20 engines that I ran in Super Comp. Those combos were as consistent as I could have ever wanted and easy on parts. No matter what people are saying, apples to apples, if you're buying a good, brand new set of reputable heads, the 9-12 degree stuff will have a few more mph. Granted, I outran more 12-18 degree combos than I could keep track of but those were older, outdated versions of the heads out there on the market today.

I consistently ran 183-185 on the stop and some of the newer 9-12 degree stuff is in the 187-188 range.

Before someone else says it, yes, i know there are sr20 combos out there that have been upper 180's. There is also 9-12 degree stuff that has been low 190's. I'm just talking about your average everyday build in normal atmospheric conditions.

IMO, the 183-185 range was a great place to be. I think I was chased maybe 2 or 3 times. Tommy Phillips with his sr20 combo and Gary Stinnett with his 11 degree combo are the two that stand out.

sully3358...KNOWS!

Buick Gary, WhompWhomp and Torqin all actually run the SR20 and recommend it. The last two run the SR-20 AND the Spreadport deal and still recommend the SR-20. Those guys knows and I would listen to them over someone who has not run that combination.

I would also call a few good engine builders who build both and get their opinions. Once again someone who has actual hands on experience with both of them. I would ask about valve train durability, power, weight and price differences.
One thing to keep in mind is those guys are also trying to sell you a motor and would rather sell you a much more expensive one than a cheaper one so be careful there.

As for anyone who is constantly bad mouthing the SR-20 (or anything) find out if they have ever actually ran them and if they know what they are talking about or if they just have a hard on against that company or product. Do not let emotions cloud your judgement, base it on facts from people who know what they are talking about.

People who actually run that combination or build them and someone who actually WINS RACES with it.

No derailment, Ed's combo is not even a remote comparison to what the OP is looking to do. Ed also has ZERO experience with either set up.

Agree Tommy and Gary both do well with these combos, but they both would do well in a POS too!

Preference on maintenance, longevity, and the 2-3 mph may be the difference for you to go spreadport...SR20 is my personal preference.

KB runs sr20 and procharger call him and ask him WHY....

ED’s combo/Car will be competing against the OP’s yours won’t dumba s s. As usual your clueless.