jrg77

I am lost looking at their price sheet. I see that they can make them pretty much how you want them. Thing is I don't know what I am supposed to want/need.

So for those of you who put AFR heads on your Gen I block what did you pick? How happy are you with your choices? What would you change?

I'm not decided on 195cc or 210cc. This is for a 400 block .040 over with 6.0" rods. I saw that you can make 500Hp at the flywheel with either - not sure what other pros and cons there are.

I'm pretty sure I want the Hydra-Rev kit.

I've heard that their stock springs are weak.

Is there something different you have to do to the heads when you change from flat tappet to roller?

Do I need the spider?

From whom did you buy them? No one local carries them (Tried to tell me that E-Tec 200s would be just as good).

Thanks,
Jason

92heritageRS

http://www.adperformance.com/index.p...416364c5b2aff0


It all depends on how you want to drive your car. 210's will put your power higher in the rpm range and make it harder for you to get too on the street while hurting low end grunt. Your T-5 will help but from what I have seen and read 210's are not worth it for a 350. On a 400 due to it moving more air the 210's would be my choice for the big HP number.

I have heard nothing but good things about the hydra rev kit. I read an article that said it gave like 15 HP but it was on an engine that really needed it (had a monster cam). I hate to quote things without the proof so I will try to find the article and post it.

Changing from flat tap to roller you just need shorter push rods. You don't have to have the spider you will need to get retro fit roller lifters that are connected by a bar to prevent the lifter from spinning.

Because you have a 400 and want 210cc's I would look at the dart 1 aluminum heads as a possible sub for the AFR's. By the way, rumor has it AFR's are on back order. It could be worth looking in to. Hope I helped!

88 350 tpi formula

iTrader: (9)

if I don't sell my car soon I may have some 195 afr heads for you they are on a sbc 400 right now

fireturd350

iTrader: (8)

210s are setup for a solid roller out of the box (that's 220 lbs closed and 400+ lbs open). So if you want to run hydra lifters you'll need to have them put in different springs.

As for backorders it seems like AFR is always a little slow.


I would check out this page --> http://tenperf.com/products/afrfaqinfo.htm

Decent info on AFR heads and Dave is excellent about answering questions, not to mention they have slightly better prices than AFR direct.

jrg77

Talked with a tech at Crane Cams... said rev kits are for solid lifters not hydraulic, that hydraulic roller spring rates are very low and thus don't need them? Now I'm wondering what the Hydra in Hydra-Rev is all about...

The typical line about 400s is that they have sufficient torque that you can trade some for some higher end power.

I've thought about Dart Pro 1s. They have similar flow numbers to the 195cc IIRC. I don't know how much of a savings they will be however. It seems like all of the heads with those flow numbers are around $1300-$2000. The question that hasn't been asked is how does their velocity compare.

Taken from the Reher-Morrison website:
Simple airflow capacity should never be the first consideration in evaluating cylinder heads. Characteristics that are far more important include air speed, port cross section, port volume and shape, and the relationship between the size of the throat and the valve seat. If these attributes are wrong, you can work forever on the flow bench and not overcome the fundamental flaws.

I want to drive the car where I'm cruisin about 80 and punch it and get tossed into the back seat. I'm not into burnouts or wakin' the neighbors. Surprising the heck out of BMWs and Mercedes Benzes above 100 is more interesting. Some of it is gearing more you gotta be able to breathe hard and fast to play in their league.

Jason

fireturd350

iTrader: (8)

From what I've heard around rev kits on hydraulic lifters there in place to help prevent valve float from happening as quickly. From my understanding it was for people that wish to turn around 6500 RPMs or more and want extra precautions to help prevent float.

I used a rev kit on my solid roller setup just for the fact it was an extra precaution if something went wrong. At least now if I loose pressure a lifter will hopefully not come out of the hole and allow large pieces to fall in.

Call up the AFR Tech Line and ask them: 1-818-890-0616