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750 DP jet sizes
Hello guys,
I was looking for a 650 dp instead i bought me a used 750 dp 4779-9. looks brand new i couldn't pass it up for $150 bucks. What jets sizes do you all recommend, to work with my combo below. 1968 350 over 30 2 bolt maine RPM Edelbrock Aluminum cylinder heads 64cc chambers 185CC runners Edelbrock head bolts 8550 Howards Cam 221/221 duration lift 470 108lsa Howards lifters anti-pump Comp Cam 1.52 roller tip rockers Edelbrock head gasket .038 Edelbrock RPM Air gap 570 Street Avenger Mallory dis. HEI 6L MSD box 1 5/8 headers with 3" flange with flowmasters/dumps PA 700R4 transmission and 2200-2500 Hughes Stall Lock-up 373 POS. 10 bolt
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Thanks ericnova7, its in a 68 camaro RS. I will follow your advice 😁
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Moving to Hotrodding Basics forum.
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Thanks Crosley
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You need to set this up with a transmission pressure gauge to insure the modulation on the 700R4 is in specification. Holley specifically warns in their specifications that the Double Pumper is not for use with overdrive automatics by that they mean, but don't say, the 700R4.
The issue is the throttle linkage position for what they call kick down is for manual kick down (passing gear) not for pressure modulation as in the TH350 which uses manifold vacuum for modulation and a throttle valve mechanical link for "passing gear" forced downshift. The 700R4 combined these functions into the mechanically linked TV connection therefore is sensitive to the amount of TV extension to throttle blade angle. The Holley TV hole on the DP carb's throttle bracket is not quite right for the modulation job in this regard. Not that this isn't done (using the kick down for modulation with the 700R4) but given this transmissions sentivities to the TV set up it is a wise practice to test the generated pressures against book values. You want to meet or exceed these, falling short eats the band and clutches often suddenly, extending high just makes for harsh shifts. Plenty of instructions are on the web for how to adjust the 700R4 TV cable and there are pressure spec's out there as well. Compared to the cost of fixing the transmission if you get this wrong, jet sizes are the least of your worries. However, expect even an unmolested DP to exhibit rich on the street. But you'll have to test to find out so document where your starting from. Bogie |
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Thanks for the info, i have burn a couple of transmissions back in my teenage days for the same reason
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There are linkage connection adapters made just for the purpose of connecting 700R4 and 200-4R overdrive TV cables to Holley and Edelbrock carbs.
That would be the very first thing you need. https://www.holley.com/products/fuel...e/parts/20-121 |
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