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Post by gotskunked on Jan 11, 2006 16:26:47 GMT -5
i have a 70 nova and and building a 434 sbc 18 degree and was woundering about the 18 spx whats good about them or not. they are the cheeper way to go and can use my rocker arms and stuff. dose many people use these heads. thanks
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Post by Gary on Jan 11, 2006 22:23:47 GMT -5
I have a friend who has been 5.55 @128 in the 1/8 in a 3300 lb car with a 414 ci motor. Bigest thing is that the push rod hole is in the intake runner and cuts down on flow a little but Mike can fix that for you. Gary
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Post by Jason G on Jan 13, 2006 22:15:56 GMT -5
I've got an extensively ported set on a 4.145" bore x 4.125" stroke - 445 ci SBC.
The pushrod pinch is a restriction and the valvetrain geometry with standard rockers is less than ideal. I would bite the bullet and go with a true 18 deg. head (if not 15 deg. or less) with shaft rockers.
I wish I had.
The 18x also uses a 10 deg. intake face angle so manifold choice is limited as well. Only the Brodix 1800/1801 etc. will work and they need quite a bit of work to be good.
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Post by Jason G on Jan 13, 2006 22:18:32 GMT -5
Gary,
How much N2O on the 414? 350+ shot? Fogger?
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Post by gotskunked on Jan 14, 2006 1:14:00 GMT -5
would this cam work good with the 18 degree heads in my nova. 1ts got 4.56 with a turbo 350 with a 4500 converter with 30x12.5 et streets. .696 int and 706 ext and 280int and 290 ext @50 on a 106 lobe separation. ill proubly have to change some things on the car to make right for new motor. old motor 377 with dart iron eagles
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Post by Jason G on Jan 14, 2006 1:21:58 GMT -5
gotskunked,
The cam would work OK, but there will be power left on the table.
To take advantage of the 18 deg. heads you need more lift than the cam you listed. The biggest advantage of the 18 deg. heads is in the .500+" lift range.
You'll need the converter to flash in the 5200-5500 RPM range to work best at the track.
Jason
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Post by gotskunked on Jan 14, 2006 1:37:15 GMT -5
would this cam fit a 434 sbc 18* ? .696 int and 706 ext and 280int and 290ext @50. do you think it might need more lift to utilize the heads. I want a 15.1 motor only with this one and all for fun to basically see how fast i can get it to go . hope low mid to low 9s. i got the 18x there on the way. ill have cfm work them over and they should be fine for me .
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Post by gotskunked on Jan 14, 2006 1:39:42 GMT -5
trying to figure this dam board out ,im reposting and S**t sorry about that last post
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Post by gotskunked on Jan 14, 2006 1:43:28 GMT -5
jason how much lift do you recomend. 750 area i could do that with rocker rato.
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Post by Jason G on Jan 14, 2006 16:52:34 GMT -5
.750" net lift would be a step in the right direction. Be sure to have the intake ported as well.
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Post by gotskunked on Jan 14, 2006 23:18:07 GMT -5
jason do you no where i could get a cam between .750 to .800 lift or not . how about 1.70 rockers or that not the right way to do it. sending mike my clylinder heads as soon as i recieve them to to the hole 9 yards to them. (18 spx ). thanks for the information.
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Post by Gary on Jan 14, 2006 23:52:37 GMT -5
Jason single NX plate. It is listed in the best performances on this site. I would go with a custom grind cam. I have had great luck with cam motion. Just call and give them all your specs and what you are doing with the engine and they will set you up. Thanks Gary
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Post by Jason G on Jan 22, 2006 19:01:11 GMT -5
gotskunked,
Going to 1.70 rockers is fine. You are probably going to have too much overlap with a 106 LSA with a 280/290 cam though.
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jason
New Member
Posts: 0
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Post by jason on Jan 25, 2006 18:12:17 GMT -5
i have a set of 18spx's for sale. email z-car@rtconline.com
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