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Geday newby here has anyone had any problems with the 302 rod on a 351 crank set up i be told i can only run open chamber heads since a guy told me the piston hight is higher than the 351 stroke i have closed chamber that have been semi miled out about 5 mm i allready have the right pistons to sute this set up so can anyone give me more info be for i go ahead with this next project.
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If you've already got the pistons matched to the long rod 351 then there shouldnt be any problems with C/C heads. But there isn't much benifit to a long rod with clevo's. The long rod concept was brought around to increase dwell at TDC and so increase int
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Theres no issue with running a CC head on a 351 running 302 rods. Well that is if you have enough camshaft to relieve the pressure. A mate got talked into running OC heads on a 378. He's regreting it now. It's a low comp dog of an engine. Sad really!
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m8 I done the long rod conversion to my 302 and all i can say is has made one hell of a difference, my old F100 has never had so much pep ,I would really like to see what the enging would do if it was in a falcon.
if i really get into it it start belchin
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thanks xb351 i havent as yet chosen a cam i want to go solid this time all i have is the acl racing pistons part no 8mkry9356 and some bolt on ajustabul street terras i have plenty of rods and as i speak im chasing up a 4ma wicth my other 1 died at last y
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ps i have a set of 2vcc heads with the 4v valves they have been semy miled sort of like and open chamber but there not id have to send u a pik so u know what i mean but they were good heads on my other set up
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I was told when i done my engine,doing the long rod conversion it reduces the angles of the rod to piston there for saving piston skirts. when i pulled the enging down i think there was only one piston with skirts left the rest were in pieces everywhere.
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1st bit of advice is don't even contemplate using bolt on roller rockers with a solid camshaft. The ramp rates too hard for 5/16th studs. The end result will be around 5800rpm the bolt will flex and the pushrod will impact the head. You need to run screw |
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You could get closed chamber 351 heads they were 4v heads. Closed chamber 2v's weren't fitted to 351's. XB Fairmont sedan : [email protected] |
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ok this was my old set up
a-351
b-2vcc 4v valves size in-2.19 ex-1.7. dont know the flow and yes think you are right slightly opened up closed chambers.
c-cam spek says 2800to6000 dur@50-234-244 v-lift-562-588 lobe sep-112 but i was geting power to 70
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That cam sounds like a large cam dynamics hyd cam by the specs. If it is? That cam works to 6100rpm on a dyno. By cam spec 2800-5800 of the top of my head. Next cam up is a competition cams camshaft. Thats if you don't want to spend $ on screw in studs et |
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hi xb just sent u a email with pik of the heads from your home page let me know if you dont get it allso just found a 4mab crank for sale can u tell me what is the diff from 4ma wich i have but its stuft and a 4mab?
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2/10ths of f**k all difference in regards to performance. I run a stock cast crank. Nothing special. Clevo cranks are huge and are very strong. The difference is in their preparation before fitting into an engine. XB Fairmont sedan : [email protected] |
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yeah cool i noticed that your heads have ahs poket porting mine dont yet but i will be doing them shortly as u can see they have had the chamber opend a bit the guy recons i was runing to much comp so they done that to bring the comp back down to 9.5 to 1
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On your heads just do the portwork and unshroud the valves if necessary. Don't touch the chambers apart from the deshroud. XB Fairmont sedan : [email protected] |
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i got myself another 4mab today so hopfuly will start bulding it up soon now its just thinking weather or not to go the bolt ons on screw ins and what size to go???
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If you stay hydraulic cammed go bolt ons. If you decide on a solid cam go screw ins. The cost is about the same anyway. For example stud mount crane roller rockers are about $450->490. Bolt ons are around $750->800.
With the screw in stud you nee |
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i have a v8 chev 350 and it is not runing wright put new standed heads on it new dissy new coil new plugs and leads the eng has dun about 200,000ks goes ok and idols ok but when you give it gas it back fires like dog it also has a reco 750 vacc holly tim
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cool xb i allready have street terras there ajustable bolt ons got em off a mate for 350 new still in the box with plastik rap so i guess the thing is now should i sell them for the screw ins or keep em and just go hyd again and if i stay hyd what is the
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Your best bet is to try Competition cams or run the same camshaft you have with 110 lobe sep instead of 112. Marcus at superplus runs a large hyd cam in his engine I'm pretty sure it's a competition cams camshaft. If you email superplus via http://www.supEdited by user Friday, 1 April 2005 12:52:53 AM(UTC)
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